The invention relates to a combined type plug and socket structure, which mainly comprises a socket unit, wherein the socket unit comprises a main body, two side faces of the main body are respectively provided with a left end cover, a bottom cover and a right end cover, one side of the bottom cover is provided with a live wire plug pin, a grounding plug pin and a zero wire plug pin, the upper part of the main body and the side face opposite to the bottom cover are respectively provided with a jack for plug-in of another socket unit, the main body is internally provided with a live wire plug bush, a grounding plug bush and a zero wire plug bush, the live wire plug bush is connected with the live wire plug pin, the grounding plug bush is connected with the grounding plug pin, and the zero wire plug bush is connected with the zero wire plug pin. The combined type plug and socket structure disclosed by the invention has the beneficial effects that each socket unit is provided with a group of plug pins and two groups of jacks located on different planes, the jacks can be expanded by means of interconnection of the socket units so as to meet the requirement for using a plurality of electric appliances at the same time, the number of the socket units to be spliced can be increased or decreased as required, the jacks of the two socket units back and forth are not located on the same plane, so that the interference among the jacks is prevented, and the plugs are ensured to be used in a larger area way.